Rectifier



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Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE noanmm r. cmmrz, on DANVEBS, mssnonvsnmms. assrcnoa, :8! mur. nssmnmnnrs, zro OLD COLONY muer comramr, musran, A. ooaromxon or RECTIFIER Application fied ltay 8, 1926. Serial No. 107,616.

olusively t a non-thermionic rectifier for rectifying the full wave.

The invention Will be best understood from the following description when read in the light of the accompanying dr awmgs of several examples cf the invent1on, wlnle the seope of the invention Will be more particularly pointed out in the appended cla1ms.

In the drawings Fig. 1 is a longitudinal sect1on of a rect1fier eonstructed according to'the invention;

Figs. 2 and 3 are group assemblies o:f parts of tlne device; V

Figs. et and 5 respectrvel are sect1ons on the lines 14 and 55 of ig. 1;

Fig. 6 is a detail showing another example et a rectifier eonstructed according to the invention;

Fig. 7 is et section on the luxe 7-? of Fig. 6; and

Fig. 8 shows a urther modification and corresponds to a section on the bus 88 o1c Fig. 1.

Referrin particularly to Figs. 1 to 5 of tbe drawings I bave shown a container, in the form of a glass bulb 1, for conductive gas under relatively low pressure tl 1e gas preferably being an inert monoatom1c gas, such as belium. under a pressure in the order of about 10 millimeters o] mereury.

Integrally formed with the bulb is the axially positioned tubular stem 3 which preferably is of glass and which opens to the exterior of the bulb and has the closed-end 5. Carried by the end 5 et the stem are tubes 7 Wbich preferably are of glass and formed integrally with the stem. Above the ends of the tubes 7 is a cathode herein shown in the form of a substantially closed chamber con sisting of an upper hat-shaped member 9 and a lower plate member 11, the latter at its edges being secured preferably by welding to the peripheral flange 13 of the member 9.

The plate 11 above referred to as illustrated is provided with spaced perforations 15 the edges of which are surrounded by marginal walls or sleeves 17. F itted over the ends of the sleeves 17 and over the ends of the tubes 7 are tubes 19 Which preferably are of heat refractory insulating material.

As illustrated in Figs. 1 to 5 the Cathode and tubes 19 are held in asSembled relation with the stem by a conductor 21, the end of which extends through a perforation 22 in the plate 11 and is welded thereto as indicated at 23. The upper portion of the conductor 21, which portion preferably is of nickel, is ri idly sap ported in the end 5 of the stem an has connected therto the lower portion 24 which may be of borated wire or other suitable conducting material to enable it to be fused into the closed end 5 of the stem.

Extending through the stem 3 and projecting from the closed end thereof through the tubes 7 and 19 and sleeves 17 are conductors 25 the upper ends of which constitute the anodes. The upper portions 27 of the conduetors 25 preferably are of nickel and are of such diameter relative to the internal di ameter of the sleeves 17 that they are spaced from said sleeves a distance less than the av orage distance between the atoms of the gas employed so as to reduce the effective area of the anodes and to prevent arcing. The lOW- er portions of the eonductors 25 may be of borated wire so that they may be fused into the closed end of the stem.

The bulb is shown as provided with a base 29 of insulating materiaLl Which carries four prongs 31 for adapting it to the usual form of socket employed in radio apparatus. As indicatd in Fig. 5 the conductors 25 are connected to two of the four prongs, wbile the conductor 24 is connectedto a third prong, the fourth prong being loft blank.

Conveniently during manufacture the stem 3 with the tubes 7 and conductors 25, 27 and 21, 24 may be arranged as indicated in Fig. 3 in a stem making machine. Heating of the upper end of the stem and squeezing it together will cause the parts t0 assume the form illustrated by Figs. 1 and 2. The tubes 19 may then be placed over the tubes 7. the tubes 19 for this purpose having the large diameter portions 33 forming shoulders 35 Which abut with the ends of the tubes 7. The Wire 21 is then entered into the perforation 22 in the plate 11, the latter then resting said conductor for securing said cathode to against the ends of the tubes 19 which are said press and provided with enlarged diameter ortions 37 relative position.

or receiving the sleeves 17 of the plate.

The portion ,of the tvire 21 projecting above name to this s the plate 11 is now ont off and the en of the wire weldd 'to the plate. After this the upper portion 9 of the cathode may be placed in position and welded about the edges of its ange 13 to the edges of the plate.

In the example of the invention indicated b Fi s. 6 and 7 the parts may be constructe as eretofore described exce t that the conductor 21 instead of extendmg between the tubes 19 is bent to one side and secured to the edge of the plate 11 by Welding. For adding rigidity to the construction a wire or other member 39, of similar size, shape and material as the upper portion of the conductor 21, ma be sealed at one end in the closed end 5 of t e stem and at its other end be Welded to the cathode. As illustrated, the conductor 39 is not in electrical communication With any of the prongs 31.

Instead of employing one wire or support 21 and 39 respectively in the two preceding examples of the invention these wires may apertures coinciding with said be substituted by two or more wires of relatively smaller diameter which Will reduce the efiect of the shrinkage of the glass at the closed end of the stem when it cools after being heated and squeezed about said wires. Fig. 8 illustrates a rectifier constructed according to Fig. 1, but employing two smaller wires 21 111 place of the single wire 21. In a similar manner two parallel wires of smaller diameter may be substituted for the single wires 21 and 39 in the construction shown by Figs. 6 and 7.

Although I have described for purposes of illustration several examples of my inventionit is to be understood that I am not limited thereto, but that wide deviations may be made without departing from the spirit of my invention.

Claims:

1. A gascons discharge devicecomprising a gas filled container having a reentrant stem terminating in 'a press, said press having tubular extensions, refractory insulators telescoped on said extensions and having extensions, anodes mounted in said apertures and having ends projecting beyond said insulators, a hollow cathode mounted on said insulators and leads for said anodes and cathode, the cathode lead securing all of said parts in position with respect to each other on said stem.

2. A gaseous discharge tube comprisin a stem terminating in a press and havmg tu nlar projections, insulators mounted on said projections, anodes surrounded by said insulators, a conductor sealed in said press, a cathode and securing means on the end of In testimony whereof, I have sighed my ecification.

T ORNDIKE F. CHENEY.

for retaining said anodes in 

